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Minnesota CDL Permit Test - Air Brakes

Number of questions: 25
Passing score: 20
Directions: This endorsement is required for driving a vehicle with air brakes. To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice questions. Each question has two, three or four possible answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Minnesota Commercial Driver’s Manual. Questions come from the chapters covering: Air Brakes and Combination Vehicles. The Air Brakes endorsement may be used with the Class A, B or C CDL.
You have made error so far
Passing grade —
5 or fewer errors
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1.
At what psi is the safety valve set to open?
100 psi
150 psi
200 psi
500 psi
2.
Maintain a following distance of at least ____ for every 10 feet of your vehicle if you are traveling at a speed under 40 mph.
One second
Two seconds
Three seconds
3.
What is a bobtail?
A tractor without a semi-trailer
A tractor with two semi-trailers
A tractor that goes faster than the speed limit
A tractor that goes slower than the speed limit
4.
When backing up while coupling a trailer, the tractor should be positioned:
Directly in front of the trailer.
Directly next to the trailer.
Parallel with the trailer.
5.
When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:
Slack adjuster.
Axle.
Brake drum.
Alcohol evaporator.
6.
While inspecting a coupling, you should go under the trailer and:
Detach the jaws from around the kingpin.
Make sure the locking lever is in the "emergency" position.
Remove the safety latch.
Look into the back of the fifth wheel.
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